Add a better workaround for QTBUG-54419

Whenever we open a new tab in createWindow, we now set an attribute
marking it - as soon as its URL changes the first time, we then close
and re-open it in a new tab in TabbedBrowser.

qutebrowser/browser/webengine/webenginetab.py

@@ -467,6 +467,7 @@ class WebEngineTab(browsertab.AbstractTab):
         # init js stuff
         self._init_js()
         self._child_event_filter = None
+        self.needs_qtbug54419_workaround = False
 
     def _init_js(self):
         js_code = '\n'.join([

qutebrowser/browser/webengine/webview.py

@@ -67,15 +67,6 @@ class WebEngineView(QWebEngineView):
         debug_type = debug.qenum_key(QWebEnginePage, wintype)
         log.webview.debug("createWindow with type {}".format(debug_type))
 
-        # WORKAROUND for https://bugreports.qt.io/browse/QTBUG-54419
-        vercheck = qtutils.version_check
-        qtbug_54419_fixed = ((vercheck('5.6.2') and not vercheck('5.7.0')) or
-                             qtutils.version_check('5.7.1') or
-                             os.environ.get('QUTE_QTBUG54419_PATCHED', ''))
-        if not qtbug_54419_fixed:
-            log.webview.debug("Ignoring createWindow because of QTBUG-54419")
-            return None
-
         background = False
         if wintype in [QWebEnginePage.WebBrowserWindow,
                        QWebEnginePage.WebDialog]:
@@ -91,8 +82,17 @@ class WebEngineView(QWebEngineView):
 
         tabbed_browser = objreg.get('tabbed-browser', scope='window',
                                     window=self._win_id)
-        # pylint: disable=protected-access
-        return tabbed_browser.tabopen(background=background)._widget
+        tab = tabbed_browser.tabopen(background=background)
+
+        # WORKAROUND for https://bugreports.qt.io/browse/QTBUG-54419
+        vercheck = qtutils.version_check
+        qtbug54419_fixed = ((vercheck('5.6.2') and not vercheck('5.7.0')) or
+                            qtutils.version_check('5.7.1') or
+                            os.environ.get('QUTE_QTBUG54419_PATCHED', ''))
+        if not qtbug54419_fixed:
+            tab.needs_qtbug54419_workaround = True
+
+        return tab._widget  # pylint: disable=protected-access
 
 
 class WebEnginePage(QWebEnginePage):

qutebrowser/mainwindow/tabbedbrowser.py

@@ -515,9 +515,23 @@ class TabbedBrowser(tabwidget.TabWidget):
         except TabDeletedError:
             # We can get signals for tabs we already deleted...
             return
+
         if not self.page_title(idx):
             self.set_page_title(idx, url.toDisplayString())
 
+        # If needed, re-open the tab as a workaround for QTBUG-54419.
+        # See https://bugreports.qt.io/browse/QTBUG-54419
+        if tab.needs_qtbug54419_workaround:
+            log.misc.debug("Doing QTBUG-54419 workaround for {}, "
+                           "url {}".format(tab, url))
+            self.setUpdatesEnabled(False)
+            try:
+                self.tabopen(url)
+                self.close_tab(tab, add_undo=False)
+            finally:
+                self.setUpdatesEnabled(True)
+            tab.needs_qtbug54419_workaround = False
+
     @pyqtSlot(browsertab.AbstractTab, QIcon)
     def on_icon_changed(self, tab, icon):
         """Set the icon of a tab.